blob: 19482ef0bcf170258ad01e1f65a3e5e14fcc00fb [file] [log] [blame]
/******************************************************************************
*
* Copyright (C) 2014 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#define LOG_TAG "bt_btif_config"
#include <assert.h>
#include <ctype.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include "osi/include/alarm.h"
#include "osi/include/allocator.h"
#include "btcore/include/bdaddr.h"
#include "btif_config.h"
#include "btif_config_transcode.h"
#include "btif_util.h"
#include "osi/include/compat.h"
#include "osi/include/config.h"
#include "btcore/include/module.h"
#include "osi/include/osi.h"
#include "osi/include/log.h"
#include "bt_types.h"
static const char *CONFIG_FILE_PATH = "/data/misc/bluedroid/bt_config.conf";
static const char *LEGACY_CONFIG_FILE_PATH = "/data/misc/bluedroid/bt_config.xml";
static const period_ms_t CONFIG_SETTLE_PERIOD_MS = 3000;
static void timer_config_save(void *data);
// TODO(zachoverflow): Move these two functions out, because they are too specific for this file
// {grumpy-cat/no, monty-python/you-make-me-sad}
bool btif_get_device_type(const BD_ADDR bd_addr, int *p_device_type)
{
if (p_device_type == NULL)
return FALSE;
bt_bdaddr_t bda;
bdcpy(bda.address, bd_addr);
bdstr_t bd_addr_str;
bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str));
if (!btif_config_get_int(bd_addr_str, "DevType", p_device_type))
return FALSE;
LOG_DEBUG("%s: Device [%s] type %d", __FUNCTION__, bd_addr_str, *p_device_type);
return TRUE;
}
bool btif_get_address_type(const BD_ADDR bd_addr, int *p_addr_type)
{
if (p_addr_type == NULL)
return FALSE;
bt_bdaddr_t bda;
bdcpy(bda.address, bd_addr);
bdstr_t bd_addr_str;
bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str));
if (!btif_config_get_int(bd_addr_str, "AddrType", p_addr_type))
return FALSE;
LOG_DEBUG("%s: Device [%s] address type %d", __FUNCTION__, bd_addr_str, *p_addr_type);
return TRUE;
}
static pthread_mutex_t lock; // protects operations on |config|.
static config_t *config;
static alarm_t *alarm_timer;
// Module lifecycle functions
static future_t *init(void) {
pthread_mutex_init(&lock, NULL);
config = config_new(CONFIG_FILE_PATH);
if (!config) {
LOG_WARN("%s unable to load config file; attempting to transcode legacy file.", __func__);
config = btif_config_transcode(LEGACY_CONFIG_FILE_PATH);
if (!config) {
LOG_WARN("%s unable to transcode legacy file, starting unconfigured.", __func__);
config = config_new_empty();
if (!config) {
LOG_ERROR("%s unable to allocate a config object.", __func__);
goto error;
}
}
if (config_save(config, CONFIG_FILE_PATH))
unlink(LEGACY_CONFIG_FILE_PATH);
}
// TODO(sharvil): use a non-wake alarm for this once we have
// API support for it. There's no need to wake the system to
// write back to disk.
alarm_timer = alarm_new();
if (!alarm_timer) {
LOG_ERROR("%s unable to create alarm.", __func__);
goto error;
}
return future_new_immediate(FUTURE_SUCCESS);
error:;
alarm_free(alarm_timer);
config_free(config);
pthread_mutex_destroy(&lock);
alarm_timer = NULL;
config = NULL;
return future_new_immediate(FUTURE_FAIL);
}
static future_t *shut_down(void) {
btif_config_flush();
return future_new_immediate(FUTURE_SUCCESS);
}
static future_t *clean_up(void) {
btif_config_flush();
alarm_free(alarm_timer);
config_free(config);
pthread_mutex_destroy(&lock);
alarm_timer = NULL;
config = NULL;
return future_new_immediate(FUTURE_SUCCESS);
}
const module_t btif_config_module = {
.name = BTIF_CONFIG_MODULE,
.init = init,
.start_up = NULL,
.shut_down = shut_down,
.clean_up = clean_up,
.dependencies = {
NULL
}
};
bool btif_config_has_section(const char *section) {
assert(config != NULL);
assert(section != NULL);
pthread_mutex_lock(&lock);
bool ret = config_has_section(config, section);
pthread_mutex_unlock(&lock);
return ret;
}
bool btif_config_exist(const char *section, const char *key) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
pthread_mutex_lock(&lock);
bool ret = config_has_key(config, section, key);
pthread_mutex_unlock(&lock);
return ret;
}
bool btif_config_get_int(const char *section, const char *key, int *value) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
assert(value != NULL);
pthread_mutex_lock(&lock);
bool ret = config_has_key(config, section, key);
if (ret)
*value = config_get_int(config, section, key, *value);
pthread_mutex_unlock(&lock);
return ret;
}
bool btif_config_set_int(const char *section, const char *key, int value) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
pthread_mutex_lock(&lock);
config_set_int(config, section, key, value);
pthread_mutex_unlock(&lock);
return true;
}
bool btif_config_get_str(const char *section, const char *key, char *value, int *size_bytes) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
assert(value != NULL);
assert(size_bytes != NULL);
pthread_mutex_lock(&lock);
const char *stored_value = config_get_string(config, section, key, NULL);
pthread_mutex_unlock(&lock);
if (!stored_value)
return false;
strlcpy(value, stored_value, *size_bytes);
*size_bytes = strlen(value) + 1;
return true;
}
bool btif_config_set_str(const char *section, const char *key, const char *value) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
assert(value != NULL);
pthread_mutex_lock(&lock);
config_set_string(config, section, key, value);
pthread_mutex_unlock(&lock);
return true;
}
bool btif_config_get_bin(const char *section, const char *key, uint8_t *value, size_t *length) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
assert(value != NULL);
assert(length != NULL);
pthread_mutex_lock(&lock);
const char *value_str = config_get_string(config, section, key, NULL);
pthread_mutex_unlock(&lock);
if (!value_str)
return false;
size_t value_len = strlen(value_str);
if ((value_len % 2) != 0 || *length < (value_len / 2))
return false;
for (size_t i = 0; i < value_len; ++i)
if (!isxdigit(value_str[i]))
return false;
for (*length = 0; *value_str; value_str += 2, *length += 1)
sscanf(value_str, "%02hhx", &value[*length]);
return true;
}
size_t btif_config_get_bin_length(const char *section, const char *key) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
pthread_mutex_lock(&lock);
const char *value_str = config_get_string(config, section, key, NULL);
pthread_mutex_unlock(&lock);
if (!value_str)
return 0;
size_t value_len = strlen(value_str);
return ((value_len % 2) != 0) ? 0 : (value_len / 2);
}
bool btif_config_set_bin(const char *section, const char *key, const uint8_t *value, size_t length) {
const char *lookup = "0123456789abcdef";
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
if (length > 0)
assert(value != NULL);
char *str = (char *)osi_calloc(length * 2 + 1);
if (!str)
return false;
for (size_t i = 0; i < length; ++i) {
str[(i * 2) + 0] = lookup[(value[i] >> 4) & 0x0F];
str[(i * 2) + 1] = lookup[value[i] & 0x0F];
}
pthread_mutex_lock(&lock);
config_set_string(config, section, key, str);
pthread_mutex_unlock(&lock);
osi_free(str);
return true;
}
const btif_config_section_iter_t *btif_config_section_begin(void) {
assert(config != NULL);
return (const btif_config_section_iter_t *)config_section_begin(config);
}
const btif_config_section_iter_t *btif_config_section_end(void) {
assert(config != NULL);
return (const btif_config_section_iter_t *)config_section_end(config);
}
const btif_config_section_iter_t *btif_config_section_next(const btif_config_section_iter_t *section) {
assert(config != NULL);
assert(section != NULL);
return (const btif_config_section_iter_t *)config_section_next((const config_section_node_t *)section);
}
const char *btif_config_section_name(const btif_config_section_iter_t *section) {
assert(config != NULL);
assert(section != NULL);
return config_section_name((const config_section_node_t *)section);
}
bool btif_config_remove(const char *section, const char *key) {
assert(config != NULL);
assert(section != NULL);
assert(key != NULL);
pthread_mutex_lock(&lock);
bool ret = config_remove_key(config, section, key);
pthread_mutex_unlock(&lock);
return ret;
}
void btif_config_save(void) {
assert(alarm_timer != NULL);
assert(config != NULL);
alarm_set(alarm_timer, CONFIG_SETTLE_PERIOD_MS, timer_config_save, NULL);
}
void btif_config_flush(void) {
assert(config != NULL);
assert(alarm_timer != NULL);
alarm_cancel(alarm_timer);
pthread_mutex_lock(&lock);
config_save(config, CONFIG_FILE_PATH);
pthread_mutex_unlock(&lock);
}
int btif_config_clear(void){
assert(config != NULL);
assert(alarm_timer != NULL);
alarm_cancel(alarm_timer);
pthread_mutex_lock(&lock);
config_free(config);
config = config_new_empty();
if (config == NULL) {
pthread_mutex_unlock(&lock);
return false;
}
int ret = config_save(config, CONFIG_FILE_PATH);
pthread_mutex_unlock(&lock);
return ret;
}
static void timer_config_save(UNUSED_ATTR void *data) {
assert(config != NULL);
assert(alarm_timer != NULL);
// Garbage collection process: the config file accumulates
// cached information about remote devices during regular
// inquiry scans. We remove some of these junk entries
// so the file doesn't grow indefinitely. We have to take care
// to make sure we don't remove information about bonded
// devices (hence the check for link keys).
static const size_t CACHE_MAX = 256;
const char *keys[CACHE_MAX];
size_t num_keys = 0;
size_t total_candidates = 0;
pthread_mutex_lock(&lock);
for (const config_section_node_t *snode = config_section_begin(config); snode != config_section_end(config); snode = config_section_next(snode)) {
const char *section = config_section_name(snode);
if (!string_is_bdaddr(section))
continue;
if (config_has_key(config, section, "LinkKey") ||
config_has_key(config, section, "LE_KEY_PENC") ||
config_has_key(config, section, "LE_KEY_PID") ||
config_has_key(config, section, "LE_KEY_PCSRK") ||
config_has_key(config, section, "LE_KEY_LENC") ||
config_has_key(config, section, "LE_KEY_LCSRK"))
continue;
if (num_keys < CACHE_MAX)
keys[num_keys++] = section;
++total_candidates;
}
if (total_candidates > CACHE_MAX * 2)
while (num_keys > 0)
config_remove_section(config, keys[--num_keys]);
config_save(config, CONFIG_FILE_PATH);
pthread_mutex_unlock(&lock);
}